* fix(board): show total count in Done column header and auto-load on scroll
- Column header now shows server-side doneTotal instead of loaded count
- Replace "Load more" button with IntersectionObserver sentinel for
infinite scroll in the Done column
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
* fix(board): move sentinel below imports and stabilize observer
- Move InfiniteScrollSentinel after all import statements
- Use callback ref to avoid recreating IntersectionObserver on every render
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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